This is a Phase II randomized, double-blind, placebo-controlled study of patients with STEMI. Those who agree to participate will be immediately randomized to one of two groups: a 24-h infusion of exenatide; or a 24 h infusion of placebo. We will assess the ability of exenatide to reduce ischemic injury. This study will serve as safety evaluation study as well as a pilot for a larger multicentre trial powered for clinical outcomes.